Garvin Industries 4″ Square Plenum Extension Ring, 1-1/2″ Deep, Drawn, With Conduit Knockouts, Stainless Steel

The Garvin Industries 4″ Square Plenum Extension Ring, 1-1/2″ Deep, is a reliable solution for expanding wiring capacity in plenum-rated spaces. Crafted from durable stainless steel with airtight knockouts, this extension ring is designed for quick installation onto existing boxes, making it a favorite for both new and retrofit projects.

Key Features and Benefits

• Drawn construction ensures strength and durability
• Airtight knockouts help maintain plenum integrity
• Bottom mounting slots allow fast and easy installation
• 316 stainless steel resists corrosion in harsh environments
• Expands box capacity without removing existing wiring or conduit
• UL Listed for safety and code compliance

Specifications

• Size: 4″ square
• Depth: 1-1/2″
• Material: Stainless steel
• Construction: Drawn with conduit knockouts
• Certifications: UL Listed

Common Uses

Perfect for air-plenum wall or ceiling installations where additional wiring capacity is needed for lighting fixtures, switches, receptacles, or other devices. Ideal for commercial, industrial, and institutional settings requiring code-compliant plenum solutions.